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Inverse View
It is not the case that We have no rational grounds for assuming that the same sensible qualities in bodies will always be conjoined with the same underlying powers.
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Reasons For
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Reason for
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1.
The powers by which bodies operate are entirely unknown to us.
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2.
We perceive only the sensible qualities of bodies, not their underlying causal powers.
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3.
There is no demonstrated reason why the same sensible qualities must always be paired with the same causal powers.
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Reasons Against
2 perspectives
Reason against 1 of 2
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1.
Hume's regularity theory shows causal necessity is never observed, only constant conjunction of surface phenomena.
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2.
If necessity is absent from observation, no inference from sensible qualities to stable underlying powers can be rationally secured.
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3.
The conceivability of any sensible quality existing without its customary power entails no logical contradiction, per Hume's Treatise I.iii.
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Reason against 2 of 2
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1.
Locke himself conceded in Essay II.xxxi that our nominal essences of substances never guarantee correspondence with real essences.
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2.
Without guaranteed correspondence between nominal and real essences, repeated sensible qualities provide no rational basis for inferring identical underlying powers across cases.
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